's Image Gallery

Colemanite: Ca2B6O11·5(H2O)

Comments: Coarsely crystalline colemanite, in part, covered with minute acicular crystals of strontianite.
Location: Boraxo #3 pit, Death Valley, California, USA. Scale: 30 cm.
© Dave Barthelmy

Colemanite: Ca2B6O11·5(H2O)

Comments: Large crystals of brown colemanite with second generation of absolutely clear and gemmy (colorless) colemanite. Intensely fluorescent in long and short UV..
Location: Mustafakemalpascha Mine, West-Anatolia Turkey. Scale: Crystal size: 1.3 x 1 cm.
© Fabre Minerals

Collinsite: Ca2(Mg,Fe++)(PO4)2·2(H2O)

Comments: Half nodule of nearly pure collinsite. The center of the specimen is a small piece of volcanic rock surrounded by collinsite.
Location: Francois Lake, British Columbia, Canada. Scale: 7 x 5.5 cm.
© John Veevaert

Coloradoite: HgTe

Comments: Massive, metallic coloradoite.
Location: Kalgoorlie, Western Australia, Australia. Scale: 5x2.5x1.5 cm.
© John Betts - Fine Minerals

Colquiriite: CaLiAlF6

Comments: Colorless tabular crystals of colquiriite on matrix.
Location: Serra Branca pegmatite, Pedra Lavrada, Picuí, Paraíba, Northeast Region, Brazil. Scale: Picture size 0.8 mm.
© Thomas Witzke / Abraxas-Verlag

Columbite-(Fe): Fe++Nb2O6  
Microcline: KAlSi3O8

Comments: Blocky, dark brown ferrocolumbite on pale greenish blue amazonite (microcline).
Location: Crystal Park, El Paso Co., Colorado, USA. Scale: 2.5 x 1.5 cm.
© Fabre Minerals

Columbite-(Fe): Fe++Nb2O6  
Baotite: Ba4(Ti,Nb)8Si4O28Cl

Comments: Minute brown crystalline grains of baotite in dark ferrocolumbite (columbite-(Fe)).
Location: Sheep Creek, Ravalli County, Montana. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Columbite-(Fe): Fe++Nb2O6  
Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)

Comments: Brown plumbopyrochlore crystal with dark brown ferrocolumbite (columbite-(Fe)).
Location: Holdazan, Buregteg, Mongolia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Columbite-(Fe): Fe++Nb2O6

Comments: Dark, coaly black, weathered granular ferrocolumbite. This specimen was originally identified as samarskite-(Y) and corrected by Fred Davis who studied the locality.
Location: Spinelli Samarskite Prospect, Glastonbury, Hartford Co., Connecticut, USA. Scale: Picture size 4 mm.
© Paul M. Schumacher

Columbite-(Fe): Fe++Nb2O6

Comments: Dark grains of columbite-(Fe) wtth small brown grains of fluorcarbonates of LREE. Corrected identificaton by Pavel M. Kartashov who analyzed this occurrence of 'chagbaiite'.
Location: Round Top Rhyolite, Hudspeth County, Texas, USA. Scale: Picture Size 1 mm.
© Thomas Witzke

Columbite-(Fe): Fe++Nb2O6  
Upalite: Al(UO2)3(PO4)2O(OH)·7(H2O)

Comments: Thin translucent yellowish upalite crusts on a prismatic, black columbite crystal.
Location: Thin translucent yellowish crusts on undifferntiated columbite crystal. Scale: Picture Size 2 mm.
© Jeff Weissman / Photographic Guide to Mineral Species

Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6

Comments: Small brown tabular crystals of manganocolumbite in a pegmatite.
Location: Neuland Quarry, Döbschütz, Königshain, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Columbite-(Mn): (Mn,Fe++)(Nb,Ta)2O6  
Plumbopyrochlore: (Pb,Y,U,Ca)2-xNb2O6(OH)

Comments: Yellow-brown plumbopyrochlore crystalline crust over black manganocolumbite grain. Such plumbopyrochlore-manganocolumbite ovoids with different grade of replacement are very typical for the locality.
Location: Amazonite pegmatites of Ploskaya Mt, Western Keivy Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture Size 12x10 mm.
© Pavel M. Kartashov

Colusite: Cu12-13V(As,Sb,Sn,Ge)3S16  
Arsenosulvanite: Cu3(As,V)S4

Comments: Bronzy, metallic tetragonal crystals of colusite (arsenosulvanite) in white marble.
Location: Val Bona quarry, Carrara, Italy. Scale: Picture size 1 cm.
© Dave Barthelmy

Colusite: Cu12-13V(As,Sb,Sn,Ge)3S16  
Vinciennite: Cu10Fe4Sn(As,Sb)S16

Comments: Polished section (PPL) of a Fe-rich rim of vinciennite (vinc) on earlier colusite (col). Matrix is bornite (bn).
Location: Kidd Creek Volcanogenic Massive Sulfide deposit, Western Abitibi Subprovince, Timmins, Ontario, Canada. Scale: Picture Size 0.5 mm.
© National Resouces of Canada

Comancheite: Hg13(Cl,Br)8O9

Comments: Small orange crystals of comancheite on matrix.
Location: Mariposa mine, Terlingua, Terlingua district, Brewster County, Texas, USA. Scale: Picture size 1.4 mm.
© Thomas Witzke / Abraxas-Verlag

Combeite: Na2Ca2Si3O9

Comments: Crystalline cleavage fragment of combeite.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Compreignacite: K2(UO2)6O4(OH)6·8(H2O)

Comments: Yellow crystals of compreignacite on matrix.
Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Congolite: (Fe++,Mg,Mn)3B7O13Cl

Comments: Pearly crystalline grains of congolite.
Location: Brazzaville, Pool, Congo. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Conichalcite: CaCu(AsO4)(OH)  
Willemite: Zn2SiO4

Comments: Conichalcite with willemite.
Location: Collected from the 30 level of the Tsumeb mine. Tsumeb, Namibia. Scale: 2.1 x 1.5 cm.
© John Veevaert